JPS6137180A - Split element of bamboo sword - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shinai (shinai) wariko, and more particularly to a composite shinai (shinai) in which the wariko is composed of a reinforcing member, a surface protection material, and the like.

As the name suggests, shinai are generally made from natural bamboo. The biggest drawback of bamboo shinai is that it has poor impact resistance, which means that it can crack or split during use, and there is a risk of it piercing the body.

In order to eliminate such risks, various types of composite shinai have been developed that are made from materials that do not easily crack or split even when subjected to impact. However, the reality is that almost none of the conventionally developed composite shinai are actually used. The reason for this is that the feeling of using a conventional composite shinai is completely different from the feeling of using a normal bamboo shinai. The main reason why conventional composite shinai feel different when using them is that they are constructed in a cylindrical shape like a baseball bat, or even if they are not constructed in a cylindrical shape, they are extremely heavy. This is due to the fact that it is heavy.

Therefore, in order to make the feeling of using a composite shinai comparable to the feeling of using a bamboo shinai, the shinai should be composed of a wariko rather than a cylindrical rod like a baseball bat, and the outer shape of the wariko should be changed. It is important to make the shape and weight as close to the shape and weight of a bamboo shinai as possible.

The characteristics of the outer shape of the wariko of an actual bamboo shinai are that firstly, the width and thickness at the tip and the handle of the wariko are small, and the width and thickness are large at the part slightly away from the handle. Firstly, the outer peripheral surface of the splitter is an arc-shaped surface corresponding to the outer surface of bamboo.

However, it is difficult to make the outer shape of the wariko of a composite shinai almost the same as the outer shape of the wariko of an actual bamboo shinai, which satisfies conditions such as bending rigidity, impact resistance, and light weight, due to manufacturing process and manufacturing costs. There are some restrictions from this point of view.

Therefore, an object of the present invention is to create a composite shinai wariko that combines various materials, yet has a wariko of a composite shinai that can obtain an external shape similar to the wariko of an actual bamboo shinai using a simple method and at a relatively low manufacturing cost. The goal is to provide the following.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a schematic structure of a bamboo shinai 10 made of natural bamboo material, and the bamboo shinai 10 is usually composed of q bamboo splits 12.

Figure 1 is a perspective view showing only seven of the bamboo splitters 12. Near part B
The first feature is that the width and thickness are large, and the second feature is that the outer circumferential surface la+i of the splitter 12 is an arcuate outer surface of the bamboo. The medium-thick shape of the wariko 12 has an important function in repelling the force received from the opponent's shinai, and the arc-shaped outer circumferential surfaces 1 and 3 prevents the impact acting on the body. It has an important function in alleviating pain and alleviating pain. Therefore, even in the case of a composite shinai, it is important to maintain these external features.

FIG. 3 shows the cross-sectional shape of a composite shinai, which is a composite shinai related to another application by the present applicant and which can satisfy conditions such as bending rigidity, impact resistance, and light weight. . A reinforcing member 14 is arranged at the center of this splitter. Since the reinforcing member 14 has a function of particularly increasing bending rigidity, it is preferably made of fiber-reinforced plastic (FRP) such as carbon fiber or glass fiber. Further, it is best to form the reinforcing member 14 into a box shape consisting of the upper and lower members 14a and the side members 14b, but depending on the case, only the upper and lower members i4a or the side members 14b may be formed.
It can also be done only. The region 24 surrounded by the reinforcing member 14 is preferably filled with a lightweight material such as wood, foamed plastic, or the like.

A surface protection material 16, a side protection material 18, and a back material 20 are arranged in a portion surrounding the reinforcing member 14. Of these, the surface protection material 16 and the side protection material 18 are members that are constantly subjected to direct impact from the opponent's Shinai, so it is desirable that they be made of glass, which has particularly excellent impact resistance.

When making a wariko for the composite shinai shown in Fig. 3, if the surface protection material 16 is formed into an arc shape in advance and then pasted, the outer periphery of the wariko can be made in the same way as natural bamboo material. Although it is possible to form an arcuate surface, K, which is preformed into an arcuate surface, requires a special mold to be made, which increases manufacturing costs. Therefore, the surface protection material 16 is pasted as a flat member as shown in FIG. 3, and then the cross-hatched areas shown in FIG. 3 are cut to create an arc-shaped surface similar to that of natural bamboo material. However, this method has disadvantages in that the cutting process is troublesome and the corners 22 of the reinforcing member 140 are likely to be exposed during cutting. From the viewpoint of increasing bending rigidity, it is desirable to arrange the upper reinforcing member 14a as close to the surface protection member 16 as possible, and to arrange the side members 14b as far apart as possible. , the tendency for the corners 22 of the reinforcing member 140 to be exposed during cutting becomes even greater.

Therefore, in the composite shinai splitter 12' of the present invention, as shown in FIG. 9, a filler 26 is provided between the surface protection material 16 and the reinforcing member 14 provided adjacent to the surface protection material 16. This solves the above problems.

This filler 26 has a cross-sectional shape as shown in FIG.
It has a crescent-shaped cross-sectional shape with an arcuate convex surface. By providing such a filler 26, the surface protection material 16 can be made into a flat plate-like member of equal thickness, and by pasting this on the filler 26, an arc-shaped surface similar to that of natural bamboo material can be obtained. Can be done. Therefore, there is no need to manufacture the surface maintenance material 16 using a special mold or to cut it later.

In addition, as shown in FIGS. 3 and 6, the longitudinal cross-sectional shape of the filler 26 has a maximum height at a portion somewhat near the handle (i.e., the maximum width of the splitter in FIG. 1). , it has an approximately triangular shape with the height decreasing toward the tip and proximal portions of the splitter.

In this case, as shown in FIG.
It is optional whether they are disposed over the entire length of the tube or partially as shown in FIG. As the filler 26, it is preferable to use a lightweight material such as wood or foamed plastic.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the schematic structure of a conventional shinai made of natural bamboo material. FIG. 2 is a perspective view showing seven split pieces of the bamboo shinai shown in FIG. 7. FIG. 3 is a cross-sectional view of a splitter of a composite shinai. Figure 3 is a cross-sectional view of the splitter of the composite Shinai sword according to the present invention, taken along the line F/-1t/ in Figure 3. FIGS. S and 6 are longitudinal cross-sectional views of a splitter of a composite Shinai sword according to the present invention. 12, 12'... Wariko, 16...
・Surface protection material, 26...Filling material. Figure 3 Figure 4 Figure 6

Claims (1)

[Claims] A filler 26 extending in the longitudinal direction of the splitter is provided between the surface protection material 16 and the reinforcing member 14 provided adjacent to the surface protection material 16. The shape is almost triangular, with the maximum height at the widest part of the wart, and the height decreases toward the tip and proximal part of the wart, and its cross-sectional shape is crescent-shaped with an arcuate convex surface. A bamboo sword wariko characterized by this.